The connectors, plugs and sockets category contains plugs and sockets (sometimes referred to as receptacles or couplers). There are a range of voltages available including 24VDC, 24VAC, 110-130VAC, 200-250VAC (including 220VAC,230VAC and 240VAC) 400-415VAC and 4480VAC in single phase and three phase (1P and 3P) and 2, 3, 4 or 5 pin configurations, with or without a neutral pin (3P+N+E or 3P+E) certain models also have the option of different size metal or plastic gland and auxiliary contacts. There are three types of sockets; wall sockets which are designed to be mounted to a wall or frame, couplers which are designed to only be connected to the cable and panel mounted sockets which are designed to be installed in increased safety enclosures.